873 lines
22 KiB
C
873 lines
22 KiB
C
/* $NetBSD: sys_sig.c,v 1.57 2023/10/04 20:42:38 ad Exp $ */
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/*-
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* Copyright (c) 2006, 2007, 2008 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Andrew Doran.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Copyright (c) 1982, 1986, 1989, 1991, 1993
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* The Regents of the University of California. All rights reserved.
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* (c) UNIX System Laboratories, Inc.
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* All or some portions of this file are derived from material licensed
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* to the University of California by American Telephone and Telegraph
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* Co. or Unix System Laboratories, Inc. and are reproduced herein with
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* the permission of UNIX System Laboratories, Inc.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)kern_sig.c 8.14 (Berkeley) 5/14/95
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: sys_sig.c,v 1.57 2023/10/04 20:42:38 ad Exp $");
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#include "opt_dtrace.h"
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/signalvar.h>
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#include <sys/proc.h>
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#include <sys/pool.h>
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#include <sys/syscallargs.h>
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#include <sys/kauth.h>
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#include <sys/wait.h>
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#include <sys/kmem.h>
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#include <sys/module.h>
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#include <sys/sdt.h>
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#include <sys/compat_stub.h>
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SDT_PROVIDER_DECLARE(proc);
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SDT_PROBE_DEFINE2(proc, kernel, , signal__clear,
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"int", /* signal */
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"ksiginfo_t *"); /* signal-info */
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int
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sys___sigaction_sigtramp(struct lwp *l,
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const struct sys___sigaction_sigtramp_args *uap, register_t *retval)
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{
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/* {
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syscallarg(int) signum;
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syscallarg(const struct sigaction *) nsa;
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syscallarg(struct sigaction *) osa;
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syscallarg(void *) tramp;
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syscallarg(int) vers;
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} */
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struct sigaction nsa, osa;
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int error;
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if (SCARG(uap, nsa)) {
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error = copyin(SCARG(uap, nsa), &nsa, sizeof(nsa));
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if (error)
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return (error);
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}
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error = sigaction1(l, SCARG(uap, signum),
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SCARG(uap, nsa) ? &nsa : 0, SCARG(uap, osa) ? &osa : 0,
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SCARG(uap, tramp), SCARG(uap, vers));
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if (error)
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return (error);
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if (SCARG(uap, osa)) {
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error = copyout(&osa, SCARG(uap, osa), sizeof(osa));
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if (error)
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return (error);
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}
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return 0;
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}
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/*
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* Manipulate signal mask. Note that we receive new mask, not pointer, and
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* return old mask as return value; the library stub does the rest.
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*/
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int
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sys___sigprocmask14(struct lwp *l, const struct sys___sigprocmask14_args *uap,
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register_t *retval)
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{
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/* {
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syscallarg(int) how;
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syscallarg(const sigset_t *) set;
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syscallarg(sigset_t *) oset;
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} */
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struct proc *p = l->l_proc;
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sigset_t nss, oss;
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int error;
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if (SCARG(uap, set)) {
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error = copyin(SCARG(uap, set), &nss, sizeof(nss));
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if (error)
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return error;
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}
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mutex_enter(p->p_lock);
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error = sigprocmask1(l, SCARG(uap, how),
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SCARG(uap, set) ? &nss : 0, SCARG(uap, oset) ? &oss : 0);
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mutex_exit(p->p_lock);
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if (error)
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return error;
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if (SCARG(uap, oset)) {
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error = copyout(&oss, SCARG(uap, oset), sizeof(oss));
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if (error)
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return error;
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}
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return 0;
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}
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int
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sys___sigpending14(struct lwp *l, const struct sys___sigpending14_args *uap,
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register_t *retval)
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{
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/* {
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syscallarg(sigset_t *) set;
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} */
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sigset_t ss;
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sigpending1(l, &ss);
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return copyout(&ss, SCARG(uap, set), sizeof(ss));
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}
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/*
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* Suspend process until signal, providing mask to be set in the meantime.
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* Note nonstandard calling convention: libc stub passes mask, not pointer,
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* to save a copyin.
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*/
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int
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sys___sigsuspend14(struct lwp *l, const struct sys___sigsuspend14_args *uap,
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register_t *retval)
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{
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/* {
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syscallarg(const sigset_t *) set;
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} */
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sigset_t ss;
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int error;
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if (SCARG(uap, set)) {
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error = copyin(SCARG(uap, set), &ss, sizeof(ss));
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if (error)
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return error;
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}
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return sigsuspend1(l, SCARG(uap, set) ? &ss : 0);
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}
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int
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sys___sigaltstack14(struct lwp *l, const struct sys___sigaltstack14_args *uap,
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register_t *retval)
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{
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/* {
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syscallarg(const struct sigaltstack *) nss;
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syscallarg(struct sigaltstack *) oss;
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} */
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stack_t nss, oss;
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int error;
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if (SCARG(uap, nss)) {
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error = copyin(SCARG(uap, nss), &nss, sizeof(nss));
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if (error)
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return error;
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}
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error = sigaltstack1(l,
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SCARG(uap, nss) ? &nss : 0, SCARG(uap, oss) ? &oss : 0);
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if (error)
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return error;
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if (SCARG(uap, oss)) {
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error = copyout(&oss, SCARG(uap, oss), sizeof(oss));
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if (error)
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return error;
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}
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return 0;
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}
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int
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kill1(struct lwp *l, pid_t pid, ksiginfo_t *ksi, register_t *retval)
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{
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int error;
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struct proc *p;
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if ((u_int)ksi->ksi_signo >= NSIG)
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return EINVAL;
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if (pid != l->l_proc->p_pid) {
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if (ksi->ksi_pid != l->l_proc->p_pid)
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return EPERM;
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if (ksi->ksi_uid != kauth_cred_geteuid(l->l_cred))
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return EPERM;
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switch (ksi->ksi_code) {
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case SI_USER:
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case SI_QUEUE:
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break;
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default:
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return EPERM;
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}
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}
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if (pid > 0) {
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/* kill single process */
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mutex_enter(&proc_lock);
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p = proc_find_raw(pid);
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if (p == NULL || (p->p_stat != SACTIVE && p->p_stat != SSTOP)) {
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mutex_exit(&proc_lock);
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/* IEEE Std 1003.1-2001: return success for zombies */
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return p ? 0 : ESRCH;
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}
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mutex_enter(p->p_lock);
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error = kauth_authorize_process(l->l_cred,
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KAUTH_PROCESS_SIGNAL, p, KAUTH_ARG(ksi->ksi_signo),
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NULL, NULL);
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if (!error && ksi->ksi_signo) {
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error = kpsignal2(p, ksi);
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}
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mutex_exit(p->p_lock);
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mutex_exit(&proc_lock);
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return error;
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}
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switch (pid) {
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case -1: /* broadcast signal */
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return killpg1(l, ksi, 0, 1);
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case 0: /* signal own process group */
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return killpg1(l, ksi, 0, 0);
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default: /* negative explicit process group */
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return killpg1(l, ksi, -pid, 0);
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}
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/* NOTREACHED */
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}
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int
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sys_sigqueueinfo(struct lwp *l, const struct sys_sigqueueinfo_args *uap,
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register_t *retval)
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{
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/* {
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syscallarg(pid_t int) pid;
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syscallarg(const siginfo_t *) info;
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} */
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ksiginfo_t ksi;
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int error;
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KSI_INIT(&ksi);
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if ((error = copyin(&SCARG(uap, info)->_info, &ksi.ksi_info,
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sizeof(ksi.ksi_info))) != 0)
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return error;
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return kill1(l, SCARG(uap, pid), &ksi, retval);
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}
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int
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sys_kill(struct lwp *l, const struct sys_kill_args *uap, register_t *retval)
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{
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/* {
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syscallarg(pid_t) pid;
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syscallarg(int) signum;
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} */
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ksiginfo_t ksi;
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KSI_INIT(&ksi);
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ksi.ksi_signo = SCARG(uap, signum);
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ksi.ksi_code = SI_USER;
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ksi.ksi_pid = l->l_proc->p_pid;
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ksi.ksi_uid = kauth_cred_geteuid(l->l_cred);
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return kill1(l, SCARG(uap, pid), &ksi, retval);
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}
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int
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sys_getcontext(struct lwp *l, const struct sys_getcontext_args *uap,
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register_t *retval)
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{
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/* {
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syscallarg(struct __ucontext *) ucp;
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} */
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struct proc *p = l->l_proc;
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ucontext_t uc;
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memset(&uc, 0, sizeof(uc));
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mutex_enter(p->p_lock);
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getucontext(l, &uc);
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mutex_exit(p->p_lock);
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return copyout(&uc, SCARG(uap, ucp), sizeof (*SCARG(uap, ucp)));
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}
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int
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sys_setcontext(struct lwp *l, const struct sys_setcontext_args *uap,
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register_t *retval)
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{
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/* {
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syscallarg(const ucontext_t *) ucp;
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} */
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struct proc *p = l->l_proc;
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ucontext_t uc;
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int error;
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error = copyin(SCARG(uap, ucp), &uc, sizeof (uc));
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if (error)
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return error;
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if ((uc.uc_flags & _UC_CPU) == 0)
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return EINVAL;
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mutex_enter(p->p_lock);
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error = setucontext(l, &uc);
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mutex_exit(p->p_lock);
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if (error)
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return error;
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return EJUSTRETURN;
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}
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/*
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* sigtimedwait(2) system call, used also for implementation
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* of sigwaitinfo() and sigwait().
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*
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* This only handles single LWP in signal wait. libpthread provides
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* its own sigtimedwait() wrapper to DTRT WRT individual threads.
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*/
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int
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sys_____sigtimedwait50(struct lwp *l,
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const struct sys_____sigtimedwait50_args *uap, register_t *retval)
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{
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return sigtimedwait1(l, uap, retval, copyin, copyout, copyin, copyout);
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}
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int
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sigaction1(struct lwp *l, int signum, const struct sigaction *nsa,
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struct sigaction *osa, const void *tramp, int vers)
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{
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struct proc *p;
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struct sigacts *ps;
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sigset_t tset;
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int prop, error;
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ksiginfoq_t kq;
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static bool v0v1valid;
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if (signum <= 0 || signum >= NSIG)
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return EINVAL;
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p = l->l_proc;
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error = 0;
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ksiginfo_queue_init(&kq);
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/*
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* Trampoline ABI version __SIGTRAMP_SIGCODE_VERSION (0) is reserved
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* for the legacy kernel provided on-stack trampoline. Conversely,
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* if we are using a non-0 ABI version, we must have a trampoline.
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* Only validate the vers if a new sigaction was supplied and there
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* was an actual handler specified (not SIG_IGN or SIG_DFL), which
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* don't require a trampoline. Emulations use legacy kernel
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* trampolines with version 0, alternatively check for that too.
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*
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* If version < __SIGTRAMP_SIGINFO_VERSION_MIN (usually 2), we try
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* to autoload the compat module. Note that we interlock with the
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* unload check in compat_modcmd() using kernconfig_lock. If the
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* autoload fails, we don't try it again for this process.
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*/
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if (nsa != NULL && nsa->sa_handler != SIG_IGN
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&& nsa->sa_handler != SIG_DFL) {
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if (__predict_false(vers < __SIGTRAMP_SIGINFO_VERSION_MIN)) {
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if (vers == __SIGTRAMP_SIGCODE_VERSION &&
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p->p_sigctx.ps_sigcode != NULL) {
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/*
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* if sigcode is used for this emulation,
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* version 0 is allowed.
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*/
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}
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#ifdef __HAVE_STRUCT_SIGCONTEXT
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else if (p->p_flag & PK_32) {
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/*
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* The 32-bit compat module will have
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* pre-validated this for us.
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*/
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v0v1valid = true;
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} else if ((p->p_lflag & PL_SIGCOMPAT) == 0) {
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kernconfig_lock();
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(void)module_autoload("compat_16",
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MODULE_CLASS_ANY);
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if (sendsig_sigcontext_16_hook.hooked) {
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/*
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* We need to remember if the
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* sigcontext method may be useable,
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* because libc may use it even
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* if siginfo is available.
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*/
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v0v1valid = true;
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}
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mutex_enter(&proc_lock);
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/*
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* Prevent unload of compat module while
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* this process remains.
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*/
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p->p_lflag |= PL_SIGCOMPAT;
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mutex_exit(&proc_lock);
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kernconfig_unlock();
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}
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#endif /* __HAVE_STRUCT_SIGCONTEXT */
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}
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switch (vers) {
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case __SIGTRAMP_SIGCODE_VERSION:
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/* kernel supplied trampoline. */
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if (tramp != NULL ||
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(p->p_sigctx.ps_sigcode == NULL && !v0v1valid)) {
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return EINVAL;
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}
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break;
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#ifdef __HAVE_STRUCT_SIGCONTEXT
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case __SIGTRAMP_SIGCONTEXT_VERSION_MIN ...
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__SIGTRAMP_SIGCONTEXT_VERSION_MAX:
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/* sigcontext, user supplied trampoline. */
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if (tramp == NULL || !v0v1valid) {
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return EINVAL;
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}
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break;
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#endif /* __HAVE_STRUCT_SIGCONTEXT */
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case __SIGTRAMP_SIGINFO_VERSION_MIN ...
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__SIGTRAMP_SIGINFO_VERSION_MAX:
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/* siginfo, user supplied trampoline. */
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if (tramp == NULL) {
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return EINVAL;
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}
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break;
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default:
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/* Invalid trampoline version. */
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return EINVAL;
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}
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}
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mutex_enter(p->p_lock);
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ps = p->p_sigacts;
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if (osa)
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sigaction_copy(osa, &SIGACTION_PS(ps, signum));
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if (!nsa)
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goto out;
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prop = sigprop[signum];
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if ((nsa->sa_flags & ~SA_ALLBITS) || (prop & SA_CANTMASK)) {
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error = EINVAL;
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goto out;
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}
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sigaction_copy(&SIGACTION_PS(ps, signum), nsa);
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ps->sa_sigdesc[signum].sd_tramp = tramp;
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ps->sa_sigdesc[signum].sd_vers = vers;
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sigminusset(&sigcantmask, &SIGACTION_PS(ps, signum).sa_mask);
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if ((prop & SA_NORESET) != 0)
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SIGACTION_PS(ps, signum).sa_flags &= ~SA_RESETHAND;
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if (signum == SIGCHLD) {
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if (nsa->sa_flags & SA_NOCLDSTOP)
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p->p_sflag |= PS_NOCLDSTOP;
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else
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p->p_sflag &= ~PS_NOCLDSTOP;
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|
if (nsa->sa_flags & SA_NOCLDWAIT) {
|
|
/*
|
|
* Paranoia: since SA_NOCLDWAIT is implemented by
|
|
* reparenting the dying child to PID 1 (and trust
|
|
* it to reap the zombie), PID 1 itself is forbidden
|
|
* to set SA_NOCLDWAIT.
|
|
*/
|
|
if (p->p_pid == 1)
|
|
p->p_flag &= ~PK_NOCLDWAIT;
|
|
else
|
|
p->p_flag |= PK_NOCLDWAIT;
|
|
} else
|
|
p->p_flag &= ~PK_NOCLDWAIT;
|
|
|
|
if (nsa->sa_handler == SIG_IGN) {
|
|
/*
|
|
* Paranoia: same as above.
|
|
*/
|
|
if (p->p_pid == 1)
|
|
p->p_flag &= ~PK_CLDSIGIGN;
|
|
else
|
|
p->p_flag |= PK_CLDSIGIGN;
|
|
} else
|
|
p->p_flag &= ~PK_CLDSIGIGN;
|
|
}
|
|
|
|
if ((nsa->sa_flags & SA_NODEFER) == 0)
|
|
sigaddset(&SIGACTION_PS(ps, signum).sa_mask, signum);
|
|
else
|
|
sigdelset(&SIGACTION_PS(ps, signum).sa_mask, signum);
|
|
|
|
/*
|
|
* Set bit in p_sigctx.ps_sigignore for signals that are set to
|
|
* SIG_IGN, and for signals set to SIG_DFL where the default is to
|
|
* ignore. However, don't put SIGCONT in p_sigctx.ps_sigignore, as
|
|
* we have to restart the process.
|
|
*/
|
|
if (nsa->sa_handler == SIG_IGN ||
|
|
(nsa->sa_handler == SIG_DFL && (prop & SA_IGNORE) != 0)) {
|
|
/* Never to be seen again. */
|
|
sigemptyset(&tset);
|
|
sigaddset(&tset, signum);
|
|
sigclearall(p, &tset, &kq);
|
|
if (signum != SIGCONT) {
|
|
/* Easier in psignal */
|
|
sigaddset(&p->p_sigctx.ps_sigignore, signum);
|
|
}
|
|
sigdelset(&p->p_sigctx.ps_sigcatch, signum);
|
|
} else {
|
|
sigdelset(&p->p_sigctx.ps_sigignore, signum);
|
|
if (nsa->sa_handler == SIG_DFL)
|
|
sigdelset(&p->p_sigctx.ps_sigcatch, signum);
|
|
else
|
|
sigaddset(&p->p_sigctx.ps_sigcatch, signum);
|
|
}
|
|
|
|
/*
|
|
* Previously held signals may now have become visible. Ensure that
|
|
* we check for them before returning to userspace.
|
|
*/
|
|
if (sigispending(l, 0)) {
|
|
lwp_lock(l);
|
|
l->l_flag |= LW_PENDSIG;
|
|
lwp_need_userret(l);
|
|
lwp_unlock(l);
|
|
}
|
|
out:
|
|
mutex_exit(p->p_lock);
|
|
ksiginfo_queue_drain(&kq);
|
|
|
|
return error;
|
|
}
|
|
|
|
int
|
|
sigprocmask1(struct lwp *l, int how, const sigset_t *nss, sigset_t *oss)
|
|
{
|
|
sigset_t *mask = &l->l_sigmask;
|
|
bool more;
|
|
|
|
KASSERT(mutex_owned(l->l_proc->p_lock));
|
|
|
|
if (oss) {
|
|
*oss = *mask;
|
|
}
|
|
|
|
if (nss == NULL) {
|
|
return 0;
|
|
}
|
|
|
|
switch (how) {
|
|
case SIG_BLOCK:
|
|
sigplusset(nss, mask);
|
|
more = false;
|
|
break;
|
|
case SIG_UNBLOCK:
|
|
sigminusset(nss, mask);
|
|
more = true;
|
|
break;
|
|
case SIG_SETMASK:
|
|
*mask = *nss;
|
|
more = true;
|
|
break;
|
|
default:
|
|
return EINVAL;
|
|
}
|
|
sigminusset(&sigcantmask, mask);
|
|
if (more && sigispending(l, 0)) {
|
|
/*
|
|
* Check for pending signals on return to user.
|
|
*/
|
|
lwp_lock(l);
|
|
l->l_flag |= LW_PENDSIG;
|
|
lwp_need_userret(l);
|
|
lwp_unlock(l);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
sigpending1(struct lwp *l, sigset_t *ss)
|
|
{
|
|
struct proc *p = l->l_proc;
|
|
|
|
mutex_enter(p->p_lock);
|
|
*ss = l->l_sigpend.sp_set;
|
|
sigplusset(&p->p_sigpend.sp_set, ss);
|
|
mutex_exit(p->p_lock);
|
|
}
|
|
|
|
void
|
|
sigsuspendsetup(struct lwp *l, const sigset_t *ss)
|
|
{
|
|
struct proc *p = l->l_proc;
|
|
|
|
/*
|
|
* When returning from sigsuspend/pselect/pollts, we want
|
|
* the old mask to be restored after the
|
|
* signal handler has finished. Thus, we
|
|
* save it here and mark the sigctx structure
|
|
* to indicate this.
|
|
*/
|
|
mutex_enter(p->p_lock);
|
|
l->l_sigrestore = 1;
|
|
l->l_sigoldmask = l->l_sigmask;
|
|
l->l_sigmask = *ss;
|
|
sigminusset(&sigcantmask, &l->l_sigmask);
|
|
|
|
/* Check for pending signals when sleeping. */
|
|
if (sigispending(l, 0)) {
|
|
lwp_lock(l);
|
|
l->l_flag |= LW_PENDSIG;
|
|
lwp_need_userret(l);
|
|
lwp_unlock(l);
|
|
}
|
|
mutex_exit(p->p_lock);
|
|
}
|
|
|
|
void
|
|
sigsuspendteardown(struct lwp *l)
|
|
{
|
|
struct proc *p = l->l_proc;
|
|
|
|
mutex_enter(p->p_lock);
|
|
/* Check for pending signals when sleeping. */
|
|
if (l->l_sigrestore) {
|
|
if (sigispending(l, 0)) {
|
|
lwp_lock(l);
|
|
l->l_flag |= LW_PENDSIG;
|
|
lwp_need_userret(l);
|
|
lwp_unlock(l);
|
|
} else {
|
|
l->l_sigrestore = 0;
|
|
l->l_sigmask = l->l_sigoldmask;
|
|
}
|
|
}
|
|
mutex_exit(p->p_lock);
|
|
}
|
|
|
|
int
|
|
sigsuspend1(struct lwp *l, const sigset_t *ss)
|
|
{
|
|
|
|
if (ss)
|
|
sigsuspendsetup(l, ss);
|
|
|
|
while (kpause("pause", true, 0, NULL) == 0)
|
|
;
|
|
|
|
/* always return EINTR rather than ERESTART... */
|
|
return EINTR;
|
|
}
|
|
|
|
int
|
|
sigaltstack1(struct lwp *l, const stack_t *nss, stack_t *oss)
|
|
{
|
|
struct proc *p = l->l_proc;
|
|
int error = 0;
|
|
|
|
mutex_enter(p->p_lock);
|
|
|
|
if (oss)
|
|
*oss = l->l_sigstk;
|
|
|
|
if (nss) {
|
|
if (nss->ss_flags & ~SS_ALLBITS)
|
|
error = EINVAL;
|
|
else if (nss->ss_flags & SS_DISABLE) {
|
|
if (l->l_sigstk.ss_flags & SS_ONSTACK)
|
|
error = EINVAL;
|
|
} else if (nss->ss_size < MINSIGSTKSZ)
|
|
error = ENOMEM;
|
|
|
|
if (!error)
|
|
l->l_sigstk = *nss;
|
|
}
|
|
|
|
mutex_exit(p->p_lock);
|
|
|
|
return error;
|
|
}
|
|
|
|
int
|
|
sigtimedwait1(struct lwp *l, const struct sys_____sigtimedwait50_args *uap,
|
|
register_t *retval, copyin_t fetchss, copyout_t storeinf, copyin_t fetchts,
|
|
copyout_t storets)
|
|
{
|
|
/* {
|
|
syscallarg(const sigset_t *) set;
|
|
syscallarg(siginfo_t *) info;
|
|
syscallarg(struct timespec *) timeout;
|
|
} */
|
|
struct proc *p = l->l_proc;
|
|
int error, signum, timo;
|
|
struct timespec ts, tsstart, tsnow;
|
|
ksiginfo_t ksi;
|
|
|
|
/*
|
|
* Calculate timeout, if it was specified.
|
|
*
|
|
* NULL pointer means an infinite timeout.
|
|
* {.tv_sec = 0, .tv_nsec = 0} means do not block.
|
|
*/
|
|
if (SCARG(uap, timeout)) {
|
|
error = (*fetchts)(SCARG(uap, timeout), &ts, sizeof(ts));
|
|
if (error)
|
|
return error;
|
|
|
|
if ((error = itimespecfix(&ts)) != 0)
|
|
return error;
|
|
|
|
timo = tstohz(&ts);
|
|
if (timo == 0) {
|
|
if (ts.tv_sec == 0 && ts.tv_nsec == 0)
|
|
timo = -1; /* do not block */
|
|
else
|
|
timo = 1; /* the shortest possible timeout */
|
|
}
|
|
|
|
/*
|
|
* Remember current uptime, it would be used in
|
|
* ECANCELED/ERESTART case.
|
|
*/
|
|
getnanouptime(&tsstart);
|
|
} else {
|
|
memset(&tsstart, 0, sizeof(tsstart)); /* XXXgcc */
|
|
timo = 0; /* infinite timeout */
|
|
}
|
|
|
|
error = (*fetchss)(SCARG(uap, set), &l->l_sigwaitset,
|
|
sizeof(l->l_sigwaitset));
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* Silently ignore SA_CANTMASK signals. psignal1() would ignore
|
|
* SA_CANTMASK signals in waitset, we do this only for the below
|
|
* siglist check.
|
|
*/
|
|
sigminusset(&sigcantmask, &l->l_sigwaitset);
|
|
|
|
memset(&ksi.ksi_info, 0, sizeof(ksi.ksi_info));
|
|
|
|
mutex_enter(p->p_lock);
|
|
|
|
/* Check for pending signals in the process, if no - then in LWP. */
|
|
if ((signum = sigget(&p->p_sigpend, &ksi, 0, &l->l_sigwaitset)) == 0)
|
|
signum = sigget(&l->l_sigpend, &ksi, 0, &l->l_sigwaitset);
|
|
|
|
if (signum != 0) {
|
|
/* If found a pending signal, just copy it out to the user. */
|
|
mutex_exit(p->p_lock);
|
|
goto out;
|
|
}
|
|
|
|
if (timo < 0) {
|
|
/* If not allowed to block, return an error */
|
|
mutex_exit(p->p_lock);
|
|
return EAGAIN;
|
|
}
|
|
|
|
/*
|
|
* Set up the sigwait list and wait for signal to arrive.
|
|
* We can either be woken up or time out.
|
|
*/
|
|
l->l_sigwaited = &ksi;
|
|
LIST_INSERT_HEAD(&p->p_sigwaiters, l, l_sigwaiter);
|
|
error = cv_timedwait_sig(&l->l_sigcv, p->p_lock, timo);
|
|
|
|
/*
|
|
* Need to find out if we woke as a result of _lwp_wakeup() or a
|
|
* signal outside our wait set.
|
|
*/
|
|
if (l->l_sigwaited != NULL) {
|
|
if (error == EINTR) {
|
|
/* Wakeup via _lwp_wakeup(). */
|
|
error = ECANCELED;
|
|
} else if (!error) {
|
|
/* Spurious wakeup - arrange for syscall restart. */
|
|
error = ERESTART;
|
|
}
|
|
l->l_sigwaited = NULL;
|
|
LIST_REMOVE(l, l_sigwaiter);
|
|
}
|
|
mutex_exit(p->p_lock);
|
|
|
|
/*
|
|
* If the sleep was interrupted (either by signal or wakeup), update
|
|
* the timeout and copyout new value back. It would be used when
|
|
* the syscall would be restarted or called again.
|
|
*/
|
|
if (timo && (error == ERESTART || error == ECANCELED)) {
|
|
getnanouptime(&tsnow);
|
|
|
|
/* Compute how much time has passed since start. */
|
|
timespecsub(&tsnow, &tsstart, &tsnow);
|
|
|
|
/* Subtract passed time from timeout. */
|
|
timespecsub(&ts, &tsnow, &ts);
|
|
|
|
if (ts.tv_sec < 0)
|
|
error = EAGAIN;
|
|
else {
|
|
/* Copy updated timeout to userland. */
|
|
error = (*storets)(&ts, SCARG(uap, timeout),
|
|
sizeof(ts));
|
|
}
|
|
}
|
|
out:
|
|
/*
|
|
* If a signal from the wait set arrived, copy it to userland.
|
|
* Copy only the used part of siginfo, the padding part is
|
|
* left unchanged (userland is not supposed to touch it anyway).
|
|
*/
|
|
if (error == 0 && SCARG(uap, info)) {
|
|
error = (*storeinf)(&ksi.ksi_info, SCARG(uap, info),
|
|
sizeof(ksi.ksi_info));
|
|
}
|
|
if (error == 0) {
|
|
*retval = ksi.ksi_info._signo;
|
|
SDT_PROBE(proc, kernel, , signal__clear, *retval,
|
|
&ksi, 0, 0, 0);
|
|
}
|
|
return error;
|
|
}
|